Recent magnetic resonance imaging and pathological studies have indicated that axonal loss is a major contributor to disease progression in multiple sclerosis. 1 H magnetic resonance spectroscopy, through measurement of N -acetyl aspartate, a neuronal marker, provides a unique tool to investigate this. Patients with primary progressive multiple sclerosis have few lesions on conventional MRI, suggesting that changes in normal appearing white matter, such as axonal loss, may be particularly relevant to disease progression in this group. To test this hypothesis (...) NAWM was studied with MRS, measuring the concentration of N -acetyl derived groups. Single-voxel MRS using a water-suppressed PRESS sequence was carried out in 24 patients with primary progressive multiple sclerosis and in 16 age-matched controls. Ratios of metabolite to creatine concentration were calculated in all subjects, and absolute concentrations were measured in 18 patients and all controls. NA/Cr was significantly lower in NAWM in patients than in controls, as was the absolute concentration of NA. There was no significant difference in the absolute concentration of creatine between the groups. This study supports the hypothesis that axonal loss occurs in NAWM in primary progressive multiple sclerosis and may well be a mechanism for disease progression in this group. (shrink)

While Nozick and his sympathizers assume there is a widespread anti-hedonist intuition to prefer reality to an experience machine, hedonists have marshalled empirical evidence that shows such an assumption to be unfounded. Results of several experience machine variants indicate there is no widespread anti-hedonist intuition. From these findings, hedonists claim Nozick's argument fails as an objection to hedonism. This article suggests the argument surrounding experience machines has been misconceived. Rather than eliciting intuitions about what is prudentially valuable, these intuitive judgements (...) are instead calculations about prudential pay-offs and trade-offs. This position can help explain the divergence of intuitions people have about experience machines. (shrink)

While impressed by much of what Mercier & Sperber (M&S) offer through their argumentative hypothesis, we question whether the specific competencies entailed in each system are adequate. In particular, whether system 2 might not require independent reasoning capabilities. We explore the adequacy of the explanations offered for confirmation bias and the Wason selection task.

We examined here whether people believe consumers of natural foods are more virtuous than consumers of unnatural foods. In Study One we asked student participants (n = 84; 77 female, M age = 19.5) to form an impression of another person based solely upon whether they ate natural or unnatural foods, these being determined in a pilot survey. On an open response format, participants reported more positive moral and health traits in consumers of natural foods. These findings were further confirmed (...) using rating-based evaluations. In Study Two we determined if this belief in the virtuousness of natural food consumers translated into behaviour. Student participants (n = 40; 25 female, M age = 20.2) played a trust game, exchanging tokens with a fictitious player. Incidental diet information about the fictitious player was provided, with participants in one group playing against a natural food consumer and those in another against an unnatural food consumer. Participants who played against a natural food consumer behaved as if they trusted this person more, and their performance on the game was predicted by how moral they felt the fictitious player was, but not by other attributes such as health. These findings suggest that people believe consumers of natural food are more virtuous, and we suggest this is driven by the altruistic attitudes that people believe to be associated with natural food consumption. (shrink)

Professor Stevenson's valuable paper [5] calls attention to a number of discrepancies between ‘if’ in English and its usual translation into the horseshoe of material implication. “This is not a reason for distrusting the horseshoe,” he notes, “which is useful so long as it is taken to mean just what it is defined to mean; and it is not a reason for distrusting our English if's, which in spite of their ambiguities are indispensable to our daily discourse”. Accordingly, (...) class='Hi'>Stevenson proposes to develop a “richer logic” than the ordinary one, by adding as primitives certain sentential connectives. He speaks throughout in the old terminology of “propositions” rather than in that of the sentences or statements used to express them. Thus he speaks of atomic and molecular propositions, somehow no doubt as real entities in the world, where talk of atomic and molecular sentences would save him from implicit involvement in the notorious difficulties connected with atomic facts. Finally, the inner structure of atomic sentences, and therewith of molecular ones, is never considered. Many molecular sentences contain quantifiers in interesting ways, the clarification of which would seem essential in getting at their structure. Stevenson, however, has no concern with quantifiers, and does not exhibit the quantificational structure of the English sentences considered. (shrink)

Taylor, R. A tribute.--Epistemology: Cornman, J. W. Chisholm on sensing and perceiving. Ross, J. F. Testimonial evidence. Lehrer, K. Reason and consistency. Keim, R. Epistemic values and epistemic viewpoints. Hanen, M. Confirmation, explanation, and acceptance. Canfield, J. V. "I know that I am in pain" is senseless. Steel, T. J. Knowledge and the self-presenting.--Metaphysics: Cartwright, R. Scattered objects. Duggan, T. J. Hume on causation. Arnaud, R. B. Brentanist relations. Johnson, M. L., Jr. Events as recurrables.--Ethics: Stevenson, J. T. On (...) doxastic responsibility. Feldman, F. World utilitarianism. Lamb, J. W. Some definitions for the theory of rules. Donnelly, J. Suicide: some epistemological considerations. (shrink)

Debates about human nature inform every philosophical tradition from their inception (see Stevenson 2000 for many examples). Evolutionarily based criticisms of human nature are of much more recent origin. Ironically, most evolutionarily based criticisms of human nature are directed at work whose avowed goal is to biologicize human nature and even to place human nature within an evolutionary frame. Here I will focus on accounts of human nature that begin with and come after E.O. Wilson’s sociobiology. I will also (...) focus on criticisms of human nature that arose first as responses to sociobiology. There are some more recent approaches to human nature that have much in common with the sociobiological approach and I will show that critical arguments developed to target sociobiology have purchase on related recent approaches to human nature. In what follows I will briefly outline some well-known accounts of human nature. Next I will briefly outline some key evolutionarily based arguments against such accounts of human nature. I conclude by summarizing the evolutionary case against biological accounts of human nature and endorsing it. (shrink)

Weitz claims that humanistic philosophy requires open concepts. Concepts are said to be "neutral intermediaries between words and things". For Frege they must be sharply defined; for Weitz open concepts are sets of criteria that are either nonnecessary or nonsufficient or both in the definition of something, though they may be rejectable or undebatable. Thus he dismisses with Karl Popper "essentialism," and thus also Platonism and Aristotelianism. He finds early suggestions of open concepts in C. L. Stevenson’s "Persuasive Definitions," (...) Friedrich Waismann’s "Verifiability," H. L. A. Hart’s "defeasible contracts," Wittgenstein’s "family resemblances," and W. B. Gallie’s "Essentially Contested Concepts." He asserts "... the discovery of open concepts—not just ambiguous, vague or woolly words, which open concepts and their conveying words are not—throws new light on the whole problem of conceptualization". Real definitions then can be only of closed concepts, such as may prevail in science; while the fruits of open concepts are especially characteristic of the humanities, though certainly not limited to them. (shrink)

Olthuis makes a singular contribution in bringing the "Philosophy of the Law-Idea" to the attention of philosophers who lack other access to this development in contemporary Dutch thought. His presentation concentrates on applications to ethics. He begins with a thorough exposition of G. E. Moore's ethical theory, to which he applies "history's critique"--a resumé of Ayer and Stevenson, of Oxford meta-ethics, and of the "new wave" of naturalism set in motion by Anscombe and Foot in 1958. Olthuis finds that (...) neither Moore nor the subsequent philosophers could long stave off the irreconcilable extreme of absolute value or absolute relativism. "... the main source of difficulty in the constrictive nature of the... ontological schema," and, underlying that, in the claim that theoretical thought is neutral. In a valuable final chapter, he presents a "perspective for a way out" based on work by H. Dooyeweerd and D. H. Th. Vollenhoven. One key to their Philosophy of the Law-Idea lies in "norm-laws." Like "natural" laws, what is subject to them cannot withdraw. Unlike "natural" laws, they demand human acknowledgment to be fulfilled. He rejects both "ought" and "goodness" as adequate primitive concepts for ethics in favor of stress upon its irreducible "sphere-sovereignty." The cosmos stands under a structural law-order, made up of many modal laws determining the many modalities of reality. Within the normative, ethics is only one special modal science. Its job is to investigate the ethical norm-law, that which is subject to it, and the correlations between these two.--M. B. M. (shrink)

Subtitled "Studies in Ethical Analysis," this collection of eleven essays, most of which have previously appeared in journals, deals with a number of problems central to modern ethical theory: the emotive interpretation of ethical language, persuasive definitions and their role in ethical reasoning, the cognitive versus emotive conceptions of ethics: many of these problems were first raised and examined by Stevenson in his earlier book Ethics and Language. Other essays are of a less retrospective nature: studies on Moore and (...) Dewey, naturalism and relativism in ethics, and a general discussion of the relations of linguistic analysis to philosophy as a whole. Stevenson is mainly concerned with analytical, as opposed to descriptive, ethics; and he completely avoids the topics of normative ethics except for a brief survey. The approach to ethics is therefore restricted, but there is enough here to interest the philosopher whose main area lies outside of ethics; although it presupposes no acquaintance with the author's previous work, some of the questions on emotivism and persuasive language are more motivated when seen in the context of that work.—P. J. M. (shrink)

Objects of representation: Kant's Copernican revolution re-interpreted -- Synthetic unities of experience -- Three ways in which space and time might be said to be transcendentally ideal -- The given, the unconditioned, the transcendental object, and the reality of the past -- A theory of everything?: Kant speaks to Stephen Hawking -- Opinion, belief or faith, and knowledge -- Freedom of judgment in Descartes, Spinoza, Hume and Kant -- Six levels of mentality -- A Kantian defense of freewill.

A book on the problems of ethics from the perspective of language and meaning.